[all-commits] [llvm/llvm-project] b146a5: Reapply "[RISCV] Support RISCV Atomics ABI attribu...

[Paul Kirth via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b146a57f6739846f7749daad099882fbd33e3066
      https://github.com/llvm/llvm-project/commit/b146a57f6739846f7749daad099882fbd33e3066
  Author: Paul Kirth <paulkirth at google.com>
  Date:   2024-07-02 (Tue, 02 Jul 2024)

  Changed paths:
    M lld/ELF/Arch/RISCV.cpp
    M llvm/include/llvm/Support/RISCVAttributeParser.h
    M llvm/include/llvm/Support/RISCVAttributes.h
    M llvm/lib/Support/RISCVAttributeParser.cpp
    M llvm/lib/Support/RISCVAttributes.cpp
    M llvm/lib/Target/RISCV/MCTargetDesc/RISCVTargetStreamer.cpp
    M llvm/test/CodeGen/RISCV/attributes.ll
    M llvm/test/MC/RISCV/attribute.s
    M llvm/test/MC/RISCV/invalid-attribute.s

  Log Message:
  -----------
  Reapply "[RISCV] Support RISCV Atomics ABI attributes (#84597)"

This patch adds support for the atomic_abi attribute, specifid in
https://github.com/riscv-non-isa/riscv-elf-psabi-doc/blob/master/riscv-elf.adoc#tag_riscv_atomic_abi-14-uleb128version.

This was previously reverted due to ld.bfd segfaulting w/ unknown riscv
attributes. Attribute emission is now guarded by a backend flag
`--riscv-abi-attributes`, which is off by default. Linker support in
LLD for attribute merging is now in a standalone patch.

Reviewers: kito-cheng, MaskRay, asb

Reviewed By: MaskRay

Pull Request: https://github.com/llvm/llvm-project/pull/90266



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